CN203734285U - Zero line disconnection protective device of three-phase power grid - Google Patents

Zero line disconnection protective device of three-phase power grid Download PDF

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Publication number
CN203734285U
CN203734285U CN201420106174.1U CN201420106174U CN203734285U CN 203734285 U CN203734285 U CN 203734285U CN 201420106174 U CN201420106174 U CN 201420106174U CN 203734285 U CN203734285 U CN 203734285U
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China
Prior art keywords
phase
zero
zero line
wire
line
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Active
Application number
CN201420106174.1U
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Chinese (zh)
Inventor
邹永龙
蒋建杰
卢峰
周安仁
谢华跃
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Huzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Changxing Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Huzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Changxing Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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Application filed by State Grid Corp of China SGCC, Huzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd, Changxing Power Supply Co of State Grid Zhejiang Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201420106174.1U priority Critical patent/CN203734285U/en
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Publication of CN203734285U publication Critical patent/CN203734285U/en
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Abstract

The utility model relates to a zero line protective device of a three-phase power grid. The zero line protective device comprises a three-phase inlet terminal, a three-phase outlet terminal, a zero line inlet terminal and a zero line outlet terminal. A connecting conductive wire is arranged between the three-phase inlet terminal and the three-phase outlet terminal. The connecting conductive wire is provided with a switch. A zero line is arranged between the zero line inlet terminal and the zero line outlet terminal. The zero line is externally sleeved with a zero line disconnection detection mutual inductor. The connecting conductive wire is externally sleeved with a zero sequence current mutual inductor. The zero line disconnection detection mutual inductor and the zero sequence current mutual inductor are installed. Existence of current in a neutral line is detected via the zero line disconnection detection mutual inductor, and occurrence of abnormal situations in the neutral line is judged. Normal working of phase lines is judged via the zero sequence current mutual inductor so that whether the abnormal situations of the neutral line are caused by unbalance of three-phase current of the phase lines is judged. Therefore, a fault is rapidly eliminated, user power supply is recovered and service quality is enhanced.

Description

A kind of protector for null line breaking of three phase network
Technical field
The utility model relates to a kind of protector for null line breaking of three phase network.
Background technology
According to the regulation of " rural area voltage electricity technical regulation ", rural area voltage electricity net should adopt TT system, in this system except step down side neutral-point solid ground, neutral line row ground connection and should keep the insulation level equal with phase line again.
On the voltage electrical network of rural area, protector is housed, protector generally has the functions such as residual current protecting, short-circuit protection, overload protection, off zero/open-phase protection, overvoltage/under-voltage protection.Protector constantly improves through long-term, having very large improvement, but protection off zero does not also have large breakthrough only aspect communication, voltage, current protection.In actual motion, zero line usually causes broken string due to various uncertain factors, thereby has caused a large number of users household electrical appliance to suffer damage.
Summary of the invention
The problem that the utility model need to solve has been to provide a kind of protector for null line breaking of three phase network, has effectively reduced user household electrical equipment because neutral line break suffers damage.
In order to solve the problems of the technologies described above, the utility model is solved by following technical proposals:
A kind of protector for null line breaking of three phase network; comprise three-phase import terminal, three-phase outlet terminal, zero line import terminal and zero line outlet terminal; between described three-phase import terminal and described three-phase outlet terminal, be provided with and be connected wire; described connection wire is provided with switch; between described zero line import terminal and described zero line outlet terminal, be provided with zero line; described zero line is arranged with detection instrument transformer off zero outward, and described connection wire is arranged with zero sequence current mutual inductor outward.
Further, described zero sequence current mutual inductor is enclosed within outward on zero line.
Further, described connection wire comprises A wire, B wire and C wire, and described A wire is provided with the first switch, and described B wire is provided with second switch, and described C wire is provided with the 3rd switch.
Further, also comprise controller, described the first switch is the first relay, described second switch is the second relay, described the 3rd switch is the 3rd relay, described controller is by the break-make of the first Control A wire, and described controller is by the break-make of the second Control B wire, and described controller is by the break-make of the 3rd Control C wire.
Further, described controller is provided with signal alarm set.By signal alarm set, the reason that staff can find the neutral line that breaks down and the neutral line to break down fast, fixes a breakdown in time.Different signal alarm sets uses in different occasions, as more remote three phase network, preferably adopt wireless signal transmitter, send signal on staff's corresponding signal accepting device, so that the place that staff can go to fault to occur in time, solves fault.
Further, described signal alarm set is wireless signal transmitter, warning lamp or siren.
Further, described connection wire is provided with the overload protective device being connected with described detection instrument transformer off zero.Overload protective device can be realized the duplicate protection of three phase network; detection instrument transformer off zero is detecting that neutral current occurs after abnormal conditions; if data-signal passes to controller and can not get corresponding instruction; stop three phase network work; so; after the electric current of the neutral line occurs that further data change, overload protective device will be started working, and stop the work of three phase network.
The beneficial effects of the utility model:
Detection instrument transformer off zero and zero sequence current mutual inductor are installed.Detect the neutral line by detection instrument transformer off zero and whether have electric current, judge whether the neutral line abnormal conditions occur.Judge by zero sequence current mutual inductor whether phase line normally works, thereby whether contrast the abnormal conditions that judge the neutral line because the three-phase current unbalance of phase line causes, thereby quick and precisely fix a breakdown, recover customer power supply, improve service quality.
The first switch, second switch and the 3rd switch are installed.Can allow staff detect after neutral line generation current, disconnect in time three phase network, avoid user's household electrical appliance to suffer damage.
Controller is installed.Controller sets in advance corresponding signal instruction, in the three phase network course of work, receives the signal of detection instrument transformer off zero and zero sequence current mutual inductor by controller, thereby controls the operating state of the first relay, the second relay and the 3rd relay.
Brief description of the drawings
Below in conjunction with accompanying drawing, the utility model is described further:
Fig. 1 is the first structural representation of the zero line protective device of the utility model three phase network;
Fig. 2 is the second structural representation of the zero line protective device of the utility model three phase network.
Embodiment
A kind of protector for null line breaking of three phase network; as shown in Figure 1; comprise three-phase import terminal, three-phase outlet terminal, zero line import terminal and zero line outlet terminal; between three-phase import terminal and three-phase outlet terminal, be provided with and be connected wire; connect wire and be provided with switch; between zero line import terminal and zero line outlet terminal, be provided with zero line 4, outside zero line 4, be arranged with detection instrument transformer 7 off zero, connect wire and be arranged with zero sequence current mutual inductor 11 outward.Phase line is connected with being connected wire with three-phase outlet terminal by three-phase import terminal, and phase line comprises A phase, B phase and C phase.The neutral line is connected with zero line 4 by zero line import terminal board zero line outlet terminal.
The utility model concrete structure, as shown in Figure 1, connect wire and comprise A wire 1, B wire 2, C wire 3, A wire 1 is provided with the first switch 4, B wire 2 is provided with second switch 5, C wire 3 is provided with the 3rd switch 6, and zero line 4 is through detection instrument transformer 7 off zero, and A wire 1, B wire 2, C wire 3 and zero line 4 are through zero sequence current mutual inductor 11.
Operation principle of the present utility model is, A wire 1 accesses A phase by series connection, B wire 2 accesses B phase by series connection, C wire accesses C phase by series connection, zero line 4 accesses the neutral line by series connection, detection instrument transformer 7 off zero and zero sequence current mutual inductor 11 are connected with respectively corresponding electric current display instrument, staff is by the data on the electric current display instrument of connection detection instrument transformer 7 off zero, judge and in the neutral line, whether have electric current, as there is electric current, staff can disconnect the first switch 4, second switch 5 and the 3rd switch 6, simultaneously, staff is by connecting the electric current display instrument judgement of zero sequence current mutual inductor 11, whether the electric current on the neutral line is because the three-phase load imbalance of phase line causes.
As shown in Figure 2, this the practical new logical access separately of A wire 1 zero sequence current mutual inductor 8, B wire 2 is access zero sequence current mutual inductor 9 separately, with C wire 3 separately 10 judgements of access zero sequence current mutual inductor be that in mutually of A phase, B phase, C goes wrong, facilitate staff to discharge fast fault.
Detection instrument transformer 7 off zero and zero sequence current mutual inductor 11 can access controller 12 in, check the size of current of phase line and the size of current of the neutral line.As shown in Figure 2, zero sequence current mutual inductor 8, zero sequence current mutual inductor 9, zero sequence current mutual inductor 10 can be distinguished in access controller 12, check the size of current of A phase, B phase, C phase, the neutral line.
As shown in Figure 2, the first switch 4 is the first relay, second switch 5 is the second relay, the 3rd switch 6 is the 3rd relay, controller 12 is by the break-make of the first Control A wire 1, controller 12 is by the break-make of the second Control B wire 2, and controller 12 is by the break-make of the 3rd Control C wire 3.The workload that controller 12, the first relay, the second relay, the 3rd relay have reduced staff, realizes the neutral line and breaks down, and zero line protective device disconnects phase line automatically.
The overload protective device being connected with detection instrument transformer 7 off zero also can be housed on connection wire of the present utility model; overload protective device can be realized the double shield of three phase network; even if controller 12 breaks down; can not control the first relay, the second relay and the 3rd relay and disconnect the phase line of series connection separately; overload protective device also can disconnect phase line, avoids user's household electrical appliance to be damaged by the high-tension current of moment.
Described detection instrument transformer off zero 7 is zero sequence current mutual inductor, and zero sequence current mutual inductor changes the high-tension current in three phase network in the little electric current that can be received by electric current display instrument safely.
Controller 12 is provided with signal alarm set.Signal alarm set is wireless signal transmitter, warning lamp or siren.For the three phase network that has staff stationary point to check, warning lamp can be reminded staff by light flash, and siren can pass through sound prompting staff, the place on line breaking down.For the three phase network in some remote places, by wireless signal transmitter, can allow staff find fast problem circuit, and to fault through row fast processing, improve the service quality of power department.
Be more than preferred embodiment of the present utility model, those skilled in the art can carry out adaptive change according to structure, but any amendment that does not depart from function and structure principle of the present utility model all will be included in the scope of claims.

Claims (4)

1. the protector for null line breaking of a three phase network; comprise three-phase import terminal, three-phase outlet terminal, zero line import terminal and zero line outlet terminal; between described three-phase import terminal and described three-phase outlet terminal, be provided with and be connected wire; described connection wire is provided with switch; between described zero line import terminal and described zero line outlet terminal, be provided with zero line; it is characterized in that: described zero line is arranged with detection instrument transformer off zero outward, described connection wire is arranged with zero sequence current mutual inductor outward.
2. the protector for null line breaking of a kind of three phase network according to claim 1, is characterized in that: described zero sequence current mutual inductor is enclosed within outward on zero line.
3. the protector for null line breaking of a kind of three phase network according to claim 1; it is characterized in that: described connection wire comprises A wire, B wire and C wire; described A wire is provided with the first switch, and described B wire is provided with second switch, and described C wire is provided with the 3rd switch.
4. the protector for null line breaking of a kind of three phase network according to claim 3; it is characterized in that: also comprise controller; described the first switch is the first relay; described second switch is the second relay; described the 3rd switch is the 3rd relay; described controller is by the break-make of the first Control A wire, and described controller is by the break-make of the second Control B wire, and described controller is by the break-make of the 3rd Control C wire.
CN201420106174.1U 2014-03-10 2014-03-10 Zero line disconnection protective device of three-phase power grid Active CN203734285U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420106174.1U CN203734285U (en) 2014-03-10 2014-03-10 Zero line disconnection protective device of three-phase power grid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420106174.1U CN203734285U (en) 2014-03-10 2014-03-10 Zero line disconnection protective device of three-phase power grid

Publications (1)

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CN203734285U true CN203734285U (en) 2014-07-23

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105137207A (en) * 2015-09-25 2015-12-09 国网山东省电力公司济南供电公司 Three-phase power supply load unbalancing alarming device
CN113253153A (en) * 2021-04-02 2021-08-13 中国南方电网有限责任公司超高压输电公司梧州局 Neutral line abnormity judgment method based on non-fault phase second harmonic component ratio

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105137207A (en) * 2015-09-25 2015-12-09 国网山东省电力公司济南供电公司 Three-phase power supply load unbalancing alarming device
CN113253153A (en) * 2021-04-02 2021-08-13 中国南方电网有限责任公司超高压输电公司梧州局 Neutral line abnormity judgment method based on non-fault phase second harmonic component ratio

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